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| A. | don't have to | B. | oughtn't to | C. | mustn't | D. | can't |
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| A. | to operate | B. | operating | C. | operated | D. | having operated |
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| A. | which; where | B. | which; in which | C. | that; where | D. | that; in which |
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| A. | would be | B. | must be | ||
| C. | might have been | D. | should have been |
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| A. | an acute problem | B. | a more acute problem | ||
| C. | a most acute problem | D. | the most acute problem |
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